body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
    color: #333;
}

.whole_div {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 20px;
}

.intro-container {
    background-color: #fff;
    margin: 20px;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    width: 90%;
    max-width: 800px;
}

.intro-container img {
    max-width: 100%;
    height: auto;
    display: block;
    margin-bottom: 20px;
}

.tile_headline {
    font-size: 24px;
    margin-bottom: 15px;
    color: #444;
    font-weight: bold;
}

.intro-detail {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 10px;
}

.mermaid {
    max-width: 100%;
    overflow-x: auto;
}

ul {
    padding: 0;
}

li {
    list-style: none;
}

@media (max-width: 768px) {
    .intro-container {
        width: 90%;
    }

    .tile_headline {
        font-size: 20px;
    }

    .intro-detail {
        font-size: 14px;
    }
}